THE LORD TOLD THIS PARABLE, “Two men went up to the Temple to pray: one was a Pharisee and the other was a Tax-collector. The Pharisee, standing by himself, was praying like this, ‘God, I thank You that I am not like other people: dishonest, unrighteous, adulterers, or even like this tax-collector. I fast twice a week, I give a tenth of all my income.’ But the Tax-collector, standing far aside, would not even look up to heaven, but was beating his breast and saying, ‘God, be merciful to me, a sinner!’ I tell you, this man went down to his home justified, rather than the Pharisee. For all who exalt themselves will be humbled, but those who humble themselves will be exalted.”
Saint Augustine says we should focus on our own symptoms, rather than another's, when we come to the Doctor,
How useful and necessary a medicine is repentance! People who remember that they are only human will readily understand this. It is written, "God resists the proud, but gives grace to the humble" (1 Peter 5:5). The Pharisee was not rejoicing so much in his own clean bill of health as in comparing it with the diseases of others. He came to the Doctor. It would have been more worthwhile to inform Him by confession of the things that were wrong with himself, instead of keeping his wounds secret and having the nerve to crow over the scars of others. It is not surprising that the Tax-collector went away healed, since he had not been ashamed of showing where he felt pain.